#define  _CRT_SECURE_NO_WARNINGS

#include<stdio.h>

int main(void)
{
	printf("Enter initial population :");
	int st;
	scanf("%d", &st);
	while (st< 9)
	{
		printf("You should enter numbers than nine numbers: ");
		scanf("%d", &st);
	}
	int ed;
	printf("Enter end population :");
	scanf("%d", &ed);
	while (ed < st)
	{
		printf("You should enter a bigger number: ");
		scanf("%d", &ed);
	}
	int year = 0;
	while (st < ed)
	{

		st += st / 3 - st / 4;
		year++;
	}
	printf("Number of population growth: %d\n", year);
}